Appendix D "Colusa County, Sacramento Valley" Table D-41 Parameter 1980 1985 1990 1995 2000 2005 2010 2015 2020 Population 12900 14600 16300 17833 18916 21147 23787 26687.5 29588 Avg. Daily VMT/1000 382 463 564 581 574 737 781 917 1086